Ferrous sulfate solution preparation device

Abstract

The utility model relates to the technical field of iron phosphate preparation, and particularly discloses a ferrous sulfate solution preparation device which comprises a dissolving tank, a pipeline mixer and a fine preparation tank, a dissolving tank stirrer is arranged in the dissolving tank, the dissolving tank and the pipeline mixer are communicated with a water inlet pipeline, and the water inlet pipeline is used for conveying water to the dissolving tank and the fine preparation tank; the dissolving tank is used for dissolving the titanium dioxide byproduct ferrous sulfate heptahydrate in water and obtaining a ferrous sulfate saturated solution; the dissolving tank is connected with a saturated liquid pump; the saturated liquid pump is used for conveying a ferrous sulfate saturated liquid to the fine preparation tank; a steam pipeline is communicated in the dissolving tank and used for conveying steam to the bottom of the dissolving tank, and a temperature monitoring control module is arranged on the dissolving tank and used for controlling the temperature of a solution in the dissolving tank according to a preset temperature; and a flow monitoring control module is arranged on the water inlet pipeline and is used for controlling the flow of water conveyed to the dissolving tank and the fine preparation tank according to the preset flow. The scheme can solve the problems that the titanium dioxide byproduct ferrous sulfate heptahydrate in the prior art contains free water, is easy to cake and needs to be dried or crushed before being fed and blended, and the blending concentration is difficult to automatically control due to the difference of raw material components.

Description

Technical Field

[0001] The utility model relates to the technical field of ferrous phosphate preparation, in particular to a preparation device for ferrous sulfate solution. Background Technique

[0002] Driven by the high demand for lithium iron phosphate in new energy vehicles, energy storage, etc., the demand for ferrous phosphate materials has increased rapidly. In the industry, the process route of producing ferrous phosphate using ferrous sulfate as the iron source accounts for about 85%. Ferrous sulfate is a by-product of the titanium dioxide production process, and 3.5 - 4 tons of ferrous sulfate heptahydrate are by-produced per ton of titanium dioxide. Therefore, using the by-produced ferrous sulfate heptahydrate from titanium dioxide as the raw material to produce ferrous phosphate has low production costs, reduces the environmental pollution of the by-produced ferrous sulfate heptahydrate from titanium dioxide, and realizes the comprehensive utilization of resources.

[0003] Our company encountered the following problems when using the by-produced ferrous sulfate heptahydrate from titanium dioxide as the raw material to produce ferrous phosphate: First, the feeding and solution preparation efficiency of the by-produced ferrous sulfate heptahydrate from titanium dioxide is low. The by-produced ferrous sulfate heptahydrate from titanium dioxide is usually obtained by freezing crystallization and filtration separation to obtain crystals containing free water, which are prone to caking and difficult to feed. The existing process is to dry the raw materials containing free water or add a crushing process during feeding to disperse the raw materials before feeding, but this increases the production cost and energy consumption of the enterprise. Second, it is difficult to automatically control the concentration of ferrous sulfate solution. The main reason is that there are composition differences in the raw materials of the by-produced ferrous sulfate heptahydrate from titanium dioxide, and the stacking time will also cause changes in the moisture content. The existing process is to sample and analyze the concentration of each kettle of the prepared solution and adjust the concentration to be qualified, and the blending cycle is long. Therefore, there is an urgent need for a new device for preparing ferrous sulfate solution. Summary of the Utility Model

[0004] The utility model aims to provide a preparation device for ferrous sulfate solution to solve the problems in the existing process that the by-produced ferrous sulfate heptahydrate from titanium dioxide needs to be dried or crushed before feeding and blending, and the blending concentration is difficult to be automatically controlled due to the composition differences of the raw materials.

[0005] To solve the above problems, the technical solution adopted by the utility model is as follows: A preparation device for ferrous sulfate solution, including a dissolution tank, a pipeline mixer, and a fine blending tank. A dissolution tank stirrer is arranged inside the dissolution tank. A water inlet pipeline is connected between the dissolution tank and the pipeline mixer, and the water inlet pipeline is used to transport water to the dissolution tank and the fine blending tank. The dissolution tank is used to dissolve the by-produced ferrous sulfate heptahydrate from titanium dioxide in water and obtain a saturated ferrous sulfate solution; the dissolution tank is connected to a saturated liquid pump, and the saturated liquid pump is used to transport the saturated ferrous sulfate solution to the fine blending tank.

[0006] A steam pipeline is connected to the dissolution tank. The steam pipeline is used to transport steam to the bottom of the dissolution tank. A temperature monitoring and control module is provided on the dissolution tank to control the temperature of the dissolution tank according to a preset temperature. A flow monitoring and control module is provided on the incoming water pipeline. The flow monitoring and control module is used to control the flow rate of water delivered to the dissolution tank and the fine dosing tank according to a preset flow rate.

[0007] The basic principle of this solution is as follows: (1) Feed demineralized water or phosphoric acid iron washing water into the dissolution tank. Start the agitator of the dissolution tank. Use a forklift to put the by-product heptahydrate ferrous sulfate crystals of titanium dioxide into the dissolution tank. Feed low-pressure steam into the bottom of the dissolution tank to control the temperature of the solution and prepare a saturated ferrous sulfate solution at a set temperature. (2) Feed the saturated ferrous sulfate solution and demineralized water or phosphoric acid iron washing water into a pipeline mixer in proportion. After mixing evenly, enter the fine dosing tank for storage or continuously pump the prepared ferrous sulfate solution to the phosphoric acid iron production device.

[0008] The beneficial effects of this solution are as follows: In the existing process, the by-product heptahydrate ferrous sulfate of titanium dioxide needs to be dried or crushed first and then fed for preparation. Moreover, the preparation concentration is difficult to be automatically controlled due to differences in raw material components. This solution uses a large dissolution tank to prepare a saturated ferrous sulfate solution to solve the problems of low feeding efficiency of the by-product heptahydrate ferrous sulfate of titanium dioxide and the inability to continuously prepare. It uses a mixer + fine dosing tank to solve the problem of automatic control of the ferrous sulfate concentration. In the phosphoric acid iron preparation process, the feeding efficiency of the by-product heptahydrate ferrous sulfate of titanium dioxide is high. The by-product heptahydrate ferrous sulfate crystals of titanium dioxide can be directly fed and dissolved without drying or crushing, reducing processes and lowering production costs. At the same time, the concentration of the ferrous sulfate solution can be automatically controlled, and the ferrous sulfate solution can be continuously and automatically prepared, avoiding frequent sampling and analysis.

[0009] Further, a same pipeline mixer is connected between the incoming water pipeline and the dissolution tank and between the saturated liquid pump and the dissolution tank. The pipeline mixer is used to mix the saturated liquid and water evenly and then feed them into the fine dosing tank. The pipeline mixer is used to mix before the saturated solution and water enter the fine dosing tank, improving the mixing efficiency.

[0010] Further, the rotation speed of the agitator of the dissolution tank is controlled at 30 - 60 r / min.

[0011] Further, the water is demineralized water or phosphoric acid iron washing water. Recycling the water resources in the phosphoric acid iron production process is green and environmentally friendly.

[0012] Further, a fine dosing tank agitator is provided in the fine dosing tank, and the rotation speed of the fine dosing tank agitator is 10 - 30 r / min. The fine dosing tank agitator is used to stir the solution stored in the fine dosing tank to further homogenize the solution.

[0013] Further, the preset temperature value is 5 - 10 °C higher than the water temperature in the incoming water pipeline, and the preset temperature is in the range of 40 °C - 80 °C.

[0014] Furthermore, the preset flow rate is determined based on the concentration of the saturated solution at the set temperature of the dissolution tank and the concentration of the finished ferrous sulfate solution in the fine preparation tank. Since the solubility of ferrous sulfate varies at different temperatures, corresponding adaptation is required.

[0015] Furthermore, several feeding ports are provided around the dissolution tank. Simultaneous large - batch feeding is convenient and ensures that the actual amount of ferrous sulfate heptahydrate in the dissolution tank is more than the hourly consumption, guaranteeing continuous preparation.

[0016] Furthermore, a solution pump is connected below the fine preparation tank. The solution pump is used to transport the finished ferrous sulfate solution outward. It can continuously pump the prepared ferrous sulfate solution to the subsequent iron phosphate production device. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of an embodiment of the present utility model. Detailed Embodiment

[0018] The following is a more detailed description through specific embodiments:

[0019] The reference numerals in the attached drawings of the specification include: dissolution tank 1, dissolution tank stirrer 2, saturated solution pump 3, pipe mixer 4, fine preparation tank 5, fine preparation tank stirrer 6, solution pump 7.

[0020] The embodiment is basically as shown in the attached Figure 1 drawing:

[0021] An apparatus for preparing a ferrous sulfate solution includes a dissolution tank 1, a fine preparation tank 5, a saturated solution pump 3, and a pipe mixer 4. The dissolution tank 1 is a tank body installed in a pit below the ground. To facilitate large - batch feeding, multiple feeding ports are provided around the dissolution tank 1. Excessive titanium white by - product ferrous sulfate heptahydrate is put into the dissolution tank 1 through a forklift or a loader, ensuring that the actual amount of ferrous sulfate heptahydrate in the dissolution tank 1 is more than twice the hourly consumption.

[0022] A water inlet pipe is connected to the inside of the dissolution tank 1. The water inlet pipe is used to transport iron phosphate washing water or demineralized water. In this embodiment, demineralized water is taken as an example. A flow rate detection and control module is provided on the water inlet pipe to introduce demineralized water with a controllable inlet flow rate into the dissolution tank 1. A vertical dissolution tank stirrer 2 is installed in the middle of the dissolution tank 1. The dissolution tank stirrer 2 is a paddle - type stirrer, and its blades are two - layer folded - leaf type, so as to stir and dissolve ferrous sulfate heptahydrate in demineralized water. A steam pipe for introducing low - pressure steam into the solution is installed below the dissolution tank 1 to raise the solution temperature. A temperature monitoring and control module is provided inside the dissolution tank 1 to accurately control the temperature of the dissolution tank 1. In this embodiment, the temperature of the dissolution tank 1 is 5 - 10 °C higher than the water inlet temperature, and the temperature is in the range of 40 °C - 80 °C.

[0023] Install a saturated solution pump 3 on the dissolution tank 1. The precise preparation tank 5 is located on the ground. The upper part of the precise preparation tank 5 is connected to a pipeline mixer 4. The pipeline mixer 4 is respectively connected to the saturated solution pump 3 and the incoming water pipeline. The pipeline mixer 4 is used to mix the saturated solution in the dissolution tank 1 and the desalted water evenly. Among them, the saturated solution and the desalted water enter the pipeline mixer 4 according to a set flow ratio, are mixed evenly and then enter the precise preparation tank 5. The flow monitoring and control module is also used to control the flow ratio of the saturated solution and the desalted water fed into the pipeline mixer 4. The flow ratio of the saturated solution and the desalted water is determined according to the concentration of the saturated solution at the set temperature of the dissolution tank 1 and the concentration of the externally delivered finished ferrous sulfate solution. The solubility of FeSO4•7H2O is shown in the following table. The solubility is the maximum number of grams of anhydrous sulfate dissolved in 100g of water:

[0024]

[0025] Install a precise preparation tank stirrer 6 above the precise preparation tank 5. The lower end of the precise preparation tank 5 is connected to a solution pump 7, which is used to transport the prepared ferrous sulfate solution outwards. In this embodiment, the solution pump 7 is connected to an external iron phosphate production device.

[0026] The specific implementation process is as follows:

[0027] (1) Continuously feed desalted water (or washing water generated in the iron phosphate production process) into the dissolution tank 1, and the inlet water flow rate is controlled by the flow monitoring and control module.

[0028] (2) Feed low-pressure steam into the bottom of the dissolution tank 1. The dissolution tank 1 accurately controls the temperature of the dissolution tank 1 through the temperature monitoring and control module. The temperature set value is 5-10°C higher than the temperature of the incoming water, generally in the range of 40-80°C.

[0029] (3) Start the dissolution tank stirrer 2, and control the rotation speed at 30-60 r / min.

[0030] (4) Use a forklift or a fork truck to put excessive titanium white by-product ferrous sulfate heptahydrate into the dissolution tank 1 from multiple feeding ports. The actual amount of ferrous sulfate heptahydrate present in the dissolution tank 1 is more than twice the hourly consumption.

[0031] (5) Start the saturated solution pump 3 to continuously input the saturated solution into the precise preparation tank 5. At the same time, feed desalted water (or iron phosphate washing water) into the precise preparation tank 5. The saturated solution and the desalted water (or iron phosphate washing water) enter the pipeline mixer 4 according to a set flow ratio, are mixed evenly and then enter the precise preparation tank 5. The flow ratio is determined according to the concentration of the saturated solution at the set temperature of the dissolution tank 1 and the concentration of the externally delivered ferrous sulfate solution.

[0032] (6) Start the precise preparation tank stirrer 6, and control the rotation speed at 10-30 r / min.

[0033] (7) Turn on the solution pump 7 and continuously deliver the prepared ferrous sulfate solution outwards.

[0034] The above are only embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A preparation device for ferrous sulfate solution, characterized in that: It includes a dissolution tank, a pipeline mixer, and a precise preparation tank. A dissolution tank agitator is provided inside the dissolution tank. A water inlet pipeline is connected between the dissolution tank and the pipeline mixer, and the water inlet pipeline is used to convey water to the dissolution tank and the precise preparation tank. The dissolution tank is used to dissolve titanium white by-product ferrous sulfate heptahydrate in water to obtain a saturated ferrous sulfate solution; the dissolution tank is connected to a saturated solution pump, and the saturated solution pump is used to convey the saturated ferrous sulfate solution to the precise preparation tank; A steam pipeline is connected inside the dissolution tank, and the steam pipeline is used to convey steam to the bottom of the dissolution tank. A temperature monitoring and control module is provided on the dissolution tank, which is used to control the temperature of the solution in the dissolution tank according to a preset temperature; a flow monitoring and control module is provided on the water inlet pipeline, and the flow monitoring and control module is used to control the flow rate of the water conveyed to the dissolution tank and the precise preparation tank according to a preset flow rate.

2. The preparation device for a ferrous sulfate solution according to claim 1, characterized in that: The same pipeline mixer is connected between the water inlet pipeline and the dissolution tank and between the saturated solution pump and the dissolution tank. The pipeline mixer is used to mix the saturated solution and water evenly and then feed them into the precise preparation tank.

3. The preparation device for ferrous sulfate solution according to claim 1, characterized in that: The rotation speed of the dissolution tank agitator is controlled at 30 - 60 r / min.

4. The preparation device for a ferrous sulfate solution according to claim 1, characterized in that: The water is demineralized water or phosphoric acid iron washing water.

5. The preparation device for ferrous sulfate solution according to claim 1, characterized in that: The preset temperature is 5 - 10 °C higher than the water temperature in the water inlet pipeline, and the preset temperature is in the range of 40 °C - 80 °C.

6. The preparation device for ferrous sulfate solution according to claim 1, characterized in that: Several feeding ports are provided around the dissolution tank.

7. The preparation device for a ferrous sulfate solution according to claim 1, characterized in that: A solution pump outside the device is connected below the precise preparation tank, and the solution pump is used to convey the finished ferrous sulfate solution outward.

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